Publicists for outdoor concert venue Freedom Hill announced a string of shows scheduled for this summer. The Temptations and Four Tops appear June 21; STYX, Foreigner and Don Felders are July 10; Willie Nelson and Allison Krauss & Union Station come through July 13; Tony Bennett hits Aug. 15. Tickets for those shows go on sale noon Friday. Other events scheduled for this summer at the Sterling Heights venue include Il Volo June 19, Wolverine Harley Davison Harley Fest June 14, Stars & Stripes Festival June 26-29 and Festa Italiana July 18-20. The MoPop, Forever Festival and Chill on the Hill events are also expected to return this season.